Creepage distance of double glass modules

What is the difference between clearances distance and creepage distance?

Clearances distance (cl): The shortest distance through air between two conductive parts, or between a conductive part and an accessible surface. Creepage distances (cr): The shortest distance along the surface of the insulating material between two conductive live parts or between conductive live parts and accessible parts.

What is creepage distance?

Creepage distances (cr): The shortest distance along the surface of the insulating material between two conductive live parts or between conductive live parts and accessible parts. 5. CONCEPTS FROM STANDARDS

What is creepage in insulating material?

What is Creepage? Creepage (Cr) is the shortest distance along the surface of an insulating material between two conductive parts. The same considerations made for Clearance also apply to Creepage, except that the Creepage path doesn’t pass through air, but it’s bound to the surface of insulating bodies.

What are creepage and clearance?

Creepage and Clearance are, by definition, the shortest distances identified between all the possible paths between the condutive parts of interest. The drawings in the next slides show some examples of paths that are often considered when evaluating Creepage and Clearance between primary winding and secondary winding of transformers.

What factors determine the clearance and creepage distances of conductive parts?

1. Voltage The voltage between conductive parts is a primary factor in determining the necessary clearance and creepage distances. Higher voltages require greater distances to prevent electrical breakdown and surface leakage currents. 2. Pollution Degree

What is the minimum creepage distance for insulating material?

Now, let’s consider the same device with a working voltage of 250 V AC, a pollution degree of 2, and an insulating material from Material Group IIIa. To find the minimum creepage distance, we can use Table 2 below, which is also adapted from the IEC 60664-1 standard: For our example, the minimum required creepage distance is 4.0 mm.